KR20150034904A

KR20150034904A - Worm reducer for coal treatment plant

Info

Publication number: KR20150034904A
Application number: KR20130114790A
Authority: KR
Inventors: 정헌우; 김보현; 안효용; 고재필
Original assignee: 한국남부발전 주식회사; (주)하이텍산업개발
Priority date: 2013-09-26
Filing date: 2013-09-26
Publication date: 2015-04-06

Abstract

The present invention relates to a reducer for coal treatment facilities, comprising: a reducer case; a worm shaft which is vertically installed inside the reducer case and is engaged and electrically driven with a motor output shaft to be rotated; and an input gear mounted on the top of the worm shaft and engaged with a motor side gear to rotate the worm shaft. The worm shaft has an oil passage and a pumping unit. The pumping unit operates to supply oil to the motor side gear and the input gear through the oil passage. The present invention provides a new type of reducer including: a dust seal for preventing coal dust and other impurities from flowing in the reducer; the combination of a roller bearing and a ball bearing capable of effectively responding to axial and radial loads; a disk spring for reducing a backlash; a magnet for removing foreign substances such as iron powder; and a pump for the smooth supply of oil and a built-in oil filter for filtering out oil injected into the pump.

Description

{WORM REDUCER FOR COAL TREATMENT PLANT}

The present invention relates to a speed reducer for a coal handling facility, and more particularly to a speed reducer for a coal handling facility used for a conveyor drive device for transferring coal from a coal thermal power plant.

In general, thermal power generation facilities generate steam by burning fossil fuels such as petroleum, coal or gas in a boiler, and generate electricity by rotating the turbine using the generated steam.

For coal-fired thermal power plants, coal is transported to a coal carrier and unloaded from a dedicated pier built adjacent to the power plant.

For example, when a coal carrier is docked at a quay, two consecutive coal offloaders are usually used to unload the coal. To maintain the balance of the coal carrier, each continuous coal unloader is placed inside the outer hatch The coal is unloaded sequentially in the direction of the hatch.

The coal transferred from the coal carrier by the continuous coal loader is placed in a low-firing state by a conveyor, which is a conveying means, and the coal placed in the loading station is transferred to the respective process through the conveyor according to the required process.

Such a conveyor is a device for continuously conveying coal placed on a belt by circulating the belt, and includes a belt having a material such as a fabric or a steel plate, a drive device using a head pulley, a tail pulley and a plurality of idlers, a motor, .

In this case, the conveyor drive apparatus includes a type that drives a conveyor through a worm and a worm wheel, a type that drives a conveyor using a sprocket and a chain, and a conveyor drive apparatus used in a coal handling facility. A wheel speed reducer is mainly used.

The speed reducer includes a worm as an input shaft, a worm wheel as an output shaft, and a speed reducer case that houses a worm and a worm wheel, and decelerates the input from the motor at an appropriate rate to output power as driving power for driving the conveyor .

The background art of the present invention is disclosed in Korean Registered Patent No. 10-1162905 entitled " Invented Low-Firing Device for Power Plant ".

Conventional reducers used in coal handling equipment have several drawbacks as follows.

First, the oil reducer has a built-in oil seal to prevent the oil leakage inside. However, due to the fact that the surrounding environment treats the coal, dusts such as coal are very generated and the oil seal is frequently burned. Leaks or coal dusts are drawn into the reducer, damaging internal parts such as bearings and gears, and causing operating loss due to overload.

Secondly, tapered roller bearings are used for the reducer requiring strong force. However, it is effective for the axial load, but the gap may change due to the pushing due to the radial load or the grip load due to the elapse of time.

As a result, the backlash increases and the quantity of the material transferred to the conveyor changes, so that the conveyor speed must be continuously adjusted, and the wear of the gear and the bearing is severe.

Thirdly, as the gear wear is gradually elapsed, a slight gap is created between the grip load and the setting loss and fatigue, so that the backlash is increased. Therefore, the amount of the material transferred to the conveyor is changed to continuously adjust the conveyor speed. Bearing wear is severe.

Fourth, the lifetime of gear teeth and bearings is shortened due to the inflow of foreign matter generated during assembly of parts and the wearing of gears, bearings, cases, and the like.

Fifth, when the reducer is mounted upside down, the oil supply to the gearing gear is not smooth and the gears and bearings are easily worn and the service life is shortened. In order to separate the oil supply from the outside, the supply pump, And the oil supply line may be damaged.

Therefore, there is a need to improve this.

The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a dust seal capable of preventing intrusion of coal dust or the like, a combination of a roller bearing and a ball bearing that can effectively cope with an axial load and a radial load, By adopting a new type of reducer adopting the disc spring for reducing, the magnet for removing foreign substances such as cigarette, the pump for smooth oil supply, and the built-in oil filter for filtering the oil introduced into the pump, The present invention provides a speed reducer for a coal handling facility capable of maximizing the operation of the facility due to the improvement of the facility.

A speed reducer for a coal handling facility according to the present invention comprises: a speed reducer case; a worm shaft vertically installed inside the speed reducer case and rotatable with the motor output side meshed with the motor output side; and a worm shaft mounted on the upper end of the worm shaft, Wherein the worm shaft includes an oil passage and a pumping means, and the pumping means operates to allow oil to be supplied to the motor side gear and the input gear via the oil passage .

The pumping means may be a propeller type or a trochoid rotor type.

Preferably, the speed reducer case includes a drain bolt for opening and closing the drain bolt, and the drain bolt includes a magnet for attaching and removing metallic foreign substances inside the speed reducer case.

Preferably, the worm shaft includes a disc spring to prevent a clearance from being generated between the worm shaft and the speed reducer case.

Preferably, the speed reducer case has an output shaft connected to the worm shaft, and the worm shaft and the output shaft are supported by a combination of a ball bearing and a tapered roller bearing so as to correspond to an axial load and a radial load .

Preferably, the dust seal is disposed at a portion of the reduction gear case through which the front end of the output shaft extends outward.

Preferably, the speed reducer case includes an oil filter.

The decelerator for a coal handling facility according to the present invention can prevent foreign coal dust or the like from penetrating into the inside by adding a dust seal and serves to clean debris and the like attached to a shaft, It is possible to maximize the facility operation by reducing the damage of bearings and gears.

The present invention minimizes backlash and minimizes a backlash due to a tapered roller bearing which is resistant to an axial load and a ball bearing which is resistant to a radial load, It is possible to maximize the operation of the equipment by minimizing wear of gears and bearings.

In addition, by inserting the disc spring, the gap of the grip load and the setting loss and fatigue can be minimized, thereby reducing the increase of backlash, maintaining the accuracy of the conveyor transfer, and extending the service life of the apparatus.

Further, according to the present invention, by attaching a magnet to a drain bolt, the cork is attached to the magnet to prevent the flow of the cork, and when the cork is removed by disassembling the drain bolt at the time of regular inspection, .

According to the present invention, by providing a propeller or a trochoidal rotor at the lower end of the speed reducer as a method for supplying oil to the upper gear, oil can be supplied to the upper gear through the gear shaft, It is possible to reduce the wear of gears and the like, thereby increasing the operation of the equipment.

1 is a front sectional view showing a speed reducer for a coal handling facility according to an embodiment of the present invention.
2 is a side sectional view showing a speed reducer for a coal handling facility according to an embodiment of the present invention.
3 is a cross-sectional view illustrating a drain bolt to which a magnet is attached in a speed reducer for a coal handling facility according to an embodiment of the present invention.
4 is a cross-sectional view illustrating a combination of a tapered roller bearing and a ball bearing in a speed reducer for a coal handling facility according to an embodiment of the present invention.
5 is a cross-sectional view of a disc spring installed in a speed reducer for a coal handling facility according to an embodiment of the present invention and a pumping means installed in a worm shaft.
6 is a plan view and a cross-sectional view illustrating a propeller type pumping means in a speed reducer for a coal handling facility according to an embodiment of the present invention.
7 is a cross-sectional view showing a dust seal in a speed reducer for a coal handling facility according to an embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a speed reducer for a coal handling facility according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a front sectional view showing a speed reducer for a coal handling facility according to an embodiment of the present invention, and FIG. 2 is a side sectional view showing a speed reducer for a coal handling facility according to an embodiment of the present invention.

FIG. 3 is a sectional view showing a drain bolt to which a magnet is attached in a speed reducer for a coal handling facility according to an embodiment of the present invention. FIG. 3 is a cross- Sectional view showing a combination of bearings.

5 is a cross-sectional view of a disc spring installed in a speed reducer for a coal handling facility according to an embodiment of the present invention and a pumping means installed in a worm shaft.

FIG. 6 is a plan view and a cross-sectional view showing a propeller type pumping means in a speed reducer for a coal handling facility according to an embodiment of the present invention, and FIG. 7 is a view showing a dust seal in a speed reducer for a coal handling facility according to an embodiment of the present invention. Sectional view.

Referring to FIGS. 1 and 2, a speed reducer for a coal handling facility according to an embodiment of the present invention improves the support structure of shafts 11 and 13 mounted in the reducer case 10, 15 to improve the overall performance of the reducer through the improvement of the oil supply system and the like, thereby increasing the operating rate of the equipment.

The worm shaft 11, the worm wheel 12, and the output shaft 13 are connected to the bearings 21 (21, 21), respectively, in the internal space of the reducer case 10, And 22 are rotatably supported.

Here, the worm shaft 11 receives power from the output side of a motor (not shown). The worm wheel 12 and the output shaft 13 reduce the input of the speed reducer to a predetermined reduction ratio, And outputs the power as the power for operation.

A certain amount of oil for lubrication is filled in the reducer case 10, so that the lubricating oil can be lubricated at various portions inside the reducer case 10 due to the oil filled.

3, a drain bolt 18 is installed at one side of the bottom of the speed reducer case 10 so as to be fastened and detached so as to exchange oil. The end of the drain bolt 18, That is, the magnet 19 is mounted on the end portion of the bolt located inside the decelerator casing 10.

As a result, it is possible to prevent foreign matter of metal components, such as grease floating in the oil in the reduction gear case 10, such as foreign matter, gears 14 and 15, and gearbox 10 So that the lifetime of the tooth surfaces of the gears 14 and 15 and the life of the bearings 21 and 22 can be extended due to the removal of grease in the oil.

When the drain bolt 18 is disassembled at the time of regular inspection to remove the cadmium attached to the magnet 19 and then fastened again, the oil can be continuously used and the service life of the oil can be extended.

The worm shaft 11 is vertically disposed on one side of the inside of the speed reducer case 10, and is installed in a structure supported by the upper end and the lower end.

That is, the upper end of the worm shaft 11 is supported on bearings 21 and 22 while being passed over a shaft support 24 formed to extend horizontally from the inner wall of the speed reducer case 10, Is placed on a bearing cap (25) assembled to the bottom of the housing (10) and is also supported via bearings (21, 22).

Accordingly, the worm shaft 11 can be installed in a structure rotatable through the upper end portion and the lower end portion supported by the bearings 21 and 22.

4, the bearings 21 and 22 for supporting the upper end of the worm shaft 11 are formed of a combination of the ball bearings 21 and the tapered roller bearings 22, 21 and the tapered roller bearings 22 are arranged above and below each other to support the shafts 11, 13 so that they can respond positively to changes due to axial loads and radial loads.

For example, a tapered roller bearing (22) is normally used for a reducer requiring a strong force, which is effective for axial loads, but is not limited to a jumping phenomenon due to a radial load or a gap change due to a time- There are vulnerable aspects.

Therefore, in the present invention, by using the tapered roller bearing 22 resistant to the axial load and the ball bearing 21 resistant to the radial load in combination to support the shafts 11 and 13, And it becomes possible to minimize the change in the gap with the lapse of time.

A disk spring 20 is mounted on the support portion of the tapered roller bearing 22 connected to the lower end of the warm shaft 11. The disk spring 20 at this time is moved in the vertical direction along the rotation of the warm shaft 11 It is possible to perform the function of absorbing the light.

5, a bearing that supports the lower end of the worm shaft 11, that is, a tapered roller bearing 22, is provided on the inner upper end of the bearing cap 25 where the lower end of the worm shaft 11 is located. And a disk spring 20 capable of exerting its own elastic force is inserted between the bottom surface of the tapered roller bearing 22 and the end of the bearing cap 25 mounted thereon.

As a result, the disk spring 20 is interposed with the bearing at the lower end supporting portion of the warm shaft 11, so that it can withstand the creep load changing little by little as time elapses, and the clearance against the setting loss and fatigue The backlash can be minimized.

An input gear 15 is mounted on the upper end of the worm shaft 11 as a means for inputting motor-side power.

At this time, the input gear 15 is supported by the lower spacer 26 in a state of being fitted to the worm shaft 11, and is integrally fixed to the worm shaft 11 side by fastening the upper lock nut 27 do.

The input gear 15 to be mounted is engaged with the motor side gear 14 located on one side thereof so that the worm shaft 11 is rotated by the meshing transmission between the motor side gear 14 and the input gear 15. [ .

Of course, the motor side gear 14 at this time can be mounted on the output shaft (not shown) of the motor.

The worm shaft 11 is provided with an oil passage 16 extending in parallel to the central axis of the worm shaft 11. The oil passage 16 at this time is connected to the worm shaft 11 via a worm shaft (11).

The oil introduced from below the oil passage 16 is guided upward along the oil passage 16 and then is guided to the input gear 15 mounted on the upper end of the worm shaft 11 and the motor- So that the lubricant can be lubricated.

Particularly, a pumping means 17 is integrally mounted on the lower end portion of the warm shaft 11, and the pumping means 17 at this time functions to pump the lower oil while rotating together with the warm shaft 11.

Here, the pumping means 17 is an oil pump capable of applying a propeller type, a trochoid type, and the like. In the present invention, an oil pump made of a propeller type is applied.

5 and 6, a propeller 29 having a plurality of blades 28 is disposed in a bearing cap 25 having a lower end portion of the worm shaft 11, The propeller 29 disposed in this manner is coupled to the lower end surface of the worm shaft 11 through the upper surface thereof in a fastening structure and can be rotated together with the worm shaft 11 when the worm shaft 11 rotates.

An oil suction port 30 is formed in the propeller 29 so as to extend to the center along the inner surface of each bladed wheel 28. The oil suction port 30 at this time is connected to the oil passage 16).

That is, the oil inlet 30 is formed to penetrate from the outer circumferential surface of the propeller body to the center thereof in the radial direction, and is brought into contact with the lower end portion of the oil passage 16 formed along the central axis of the worm shaft 11 .

The oil sucked through the oil suction port 30 by the rotation of the propeller 29 can be sent toward the oil passage 16 of the worm shaft 11. [

In one example of the present invention, there is provided a pumping means 17 consisting of a propeller 29 having four blades 28 and four oil inlets 30, one for each blades 28, The oil sucked through the respective oil inlets 30 can be advanced to the oil passage 16 of the worm shaft 11 passing through the center of the propeller body and then to the worm shaft 11 The oil that is pumped by the pumping action of the pumping means 17 rotating together with the oil passage 16 can be lifted up through the oil passage 16 and supplied to the motor side gear 14 and the input gear 15. [

Of course, even when the trochoid rotor type is applied to the pumping means 17, the rotor is mounted on the lower end of the worm shaft 11 and rotated so that the oil pumped at this time is supplied to the motor side gear 14 And the input gear 15, as shown in Fig.

On the other hand, the worm wheel 12 and the output shaft 13 are provided as elements corresponding to the output side of the speed reducer.

The worm wheel 12 and the output shaft 13 are integrally assembled and rotated together. The worm wheel 12 and the output shaft 13 thus assembled are installed horizontally in the reducer case 10, 21 and 22, respectively.

For example, the rear end portion of the output shaft 13 to which the worm wheel 12 is assembled is supported by the front wall of the reducer case 10 by the tapered roller bearing 22 and the front end portion thereof is supported by the ball bearing 21 and the taper And is supported by the rear wall of the reduction gear case 10 by the combination of the roller bearings 22.

At this time, the tip of the output shaft 13 is positioned out of the constant-speed decelerator case 10, so that power can be transmitted to the drive shaft (not shown) side of the conveyor through this portion, The worm wheel 12 assembled in a concentric circle on the worm shaft 11 is engaged with the worm shaft 11 in a structure capable of engaging and engaging.

The output shaft 13 is also supported by a combination of the ball bearing 21 and the tapered roller bearing 22 which are arranged in succession to each other so that the support shaft 13 can support the axial load and the radial load, .

The disk spring 20 is disposed at one side of the tapered roller bearing 22 supporting the rear end of the output shaft 13 so that the disk spring 20 can withstand the creep load gradually changing with time, Setting loosening and fatigue clearance can be eliminated to minimize backlash.

7, the dust seal 23 is provided at the penetration portion of the speed reducer case 10 in which the front end portion of the output shaft 13 extends to the outside, so that external coal dust or the like is discharged from the output shaft 13 It is possible to prevent penetration into the decelerator case 10 through the clearance of the penetrating portion.

In addition, the dust seal 23 serves to prevent foreign matter and the like around the speed reducer case 10 from being drawn into the speed reducer case 10, and to clean the debris or the like attached to the output shaft 13 or the like .

In this way, the dust seal 23 functions to prevent intrusion of coal dust or the like and to remove debris such as the output shaft 13, so that it is possible to prevent the oil seal 31, etc., So that damage to the bearings 21, 22 and the gears 14, 15 can be reduced, and as a result, the operation of the equipment can be maximized.

5, the oil filter 32 is installed in the oil circulation process inside the speed reducer case 10 to prevent the foreign matter from affecting the engagement of the gears, and the oil residue at the bottom of the pump Disassembling the drag plug (33) makes it easy to clean, which is convenient for equipment maintenance.

In the present invention, in consideration of the characteristics of the speed reducer used in the coal handling facility, the magnet 19 attachment system, the combination of the ball bearing 21 and the tapered roller bearing 22, the disc spring 20 insertion system, The durability of the reducer can be improved and the durability life of various parts can be improved by adopting the supply system, the dust seal 23 insertion system, and the like, thereby providing an advantage that the operation rate of the facility can be increased.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the true scope of the present invention should be determined by the following claims.

10: Reducer case 11: Worm shaft
12: Worm wheel 13: Output shaft
14: motor side gear 15: input gear
16: Oil passage 17: Pumping means
18: drain bolt 19: magnet
20: Disk spring 21: Ball bearing
22: Tapered roller bearing 23: Dust seal
24: shaft support 25: bearing cap
26: Spacer 27: Lock nut
28: Wing car 29: Propeller
30: Oil suction port 31: Oil seal
32: Oil filter 33: Plug for dragging

Claims

Reducer case;
A worm shaft vertically installed inside the speed reducer case and rotatable while meshing with a motor output side; And
And an input gear mounted on an upper end of the worm shaft and engaged with the motor-side gear to rotate the worm shaft,
The worm shaft includes an oil passage and pumping means,
Wherein the pumping means operates so that oil is supplied to the motor side gear and the input gear via the oil passage.

The method according to claim 1,
Wherein the pumping means is a propeller type or a trochoid rotor type.

The method according to claim 1,
The speed reducer case being provided with a drain bolt for opening and closing;
Wherein the drain bolt includes a magnet for attaching and removing metallic foreign substances in the speed reducer case.

The method according to claim 1,
Wherein the worm shaft is provided with a disc spring to prevent a clearance from being generated between the worm shaft and the speed reducer case.

The method according to claim 1,
The speed reducer case has an output shaft connected to the worm shaft;
Wherein the worm shaft and the output shaft are supported by a combination of a ball bearing and a tapered roller bearing so as to correspond to an axial load and a radial load.

6. The method of claim 5,
And a dust seal is interposed in the through-hole of the reduction gear case, the forward end of the output shaft extending outward.

3. The method according to claim 1 or 2,
Wherein the speed reducer case is provided with an oil filter.